Tuna is a good source of many healthful nutrients, especially selenium, potassium, Vitamin D, Vitamin A, Vitamin B12, and omega-3 fats (the good kind of fat). For essential B12, a serving size of 100 grams of tuna fish provides 2.2 micrograms.
If you need easy-to-peel eggs and you have fresh eggs, you might want to try steaming the eggs for 15 minutes. Pour an inch of water into a pot and insert a steamer basket.Bring to a boil. Place the eggs in the steamer basket, cover and steam for 15 minutes (more or less, check!).
For a hard-boiled egg, start the egg in cold water and bring up to the boil. Once the water is gently boiling, set the timer for between 7-10 minutes depending on how well cooked you like your eggs. The longer you boil the egg, the firmer it will be. Once cooked, plunge the hard-boiled egg into plenty of cold water for one minute. Drain and cover with more cold water.